Vishay General Semiconductor - Diodes Division SMCJ26AHM3_A/H

Overview

SMCJ26AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 42.1 V maximum clamping voltage at 35.6 A peak pulse current and 26 V stand-off voltage. It features glass passivated junction, AEC-Q101 qualification, and is used for protecting MOSFETs and ICs in automotive power supply rails.

For engineers reviewing the SMCJ26AHM3_A/H datasheet, SMCJ26AHM3_A/H pinout, SMCJ26AHM3_A/H application, or SMCJ26AHM3_A/H equivalent, key selection criteria include its 26 V stand-off voltage, 42.1 V clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, halogen-free RoHS compliance, and SMC package thermal resistance of 75 °C/W junction-to-ambient.

Technical Context

This TVS diode operates as a unidirectional clamping device with a reverse breakdown voltage range of 28.9 V to 31.9 V at 1 mA test current, enabling robust overvoltage protection in DC power lines. Its low incremental surge resistance and fast response time ensure effective suppression of ESD and inductive switching transients.

The device is rated for 1500 W peak pulse power (10/1000 µs waveform), 200 A non-repetitive forward surge current (8.3 ms half-sine), and operates across -55 °C to +150 °C junction temperature range. Its matte tin-plated leads meet J-STD-002 solderability standards and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

SMCJ26AHM3_A/H uses the SMC (DO-214AB) package: a 2-terminal surface-mount case with cathode band marking on the anode side, 7.75 mm × 6.22 mm body, 2.62 mm max height, and matte tin-plated leads compatible with lead-free reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMCJ26AHM3_A/H, SMAJ26AHE3_A/H offers smaller size but reduced surge capacity and thermal performance, while SMCJ26AHE3_A/H matches form-fit-function but omits AEC-Q101 validation and halogen-free materials-making SMCJ26AHM3_A/H the sole option meeting full automotive production requirements.

Availability

SMCJ26AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial motor control, telecom power systems, and consumer appliance designs requiring stable component supply with long-term lifecycle assurance.

Supply support for SMCJ26AHM3_A/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade solutions.

The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments, targeting automotive power distribution, industrial automation, and infrastructure equipment where robustness and qualification compliance are mandatory.

FAQ

What is the clamping voltage of SMCJ26AHM3_A/H at its rated peak pulse current?

The SMCJ26AHM3_A/H has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 35.6 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88394, ensuring predictable overvoltage limiting behavior during surge events. The clamping voltage directly defines the maximum stress imposed on downstream components during transient suppression.

Is SMCJ26AHM3_A/H qualified for automotive applications?

Yes, SMCJ26AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and verified in Vishay's official documentation. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling (TCT), and highly accelerated life testing (HALT), confirming suitability for automotive powertrain, body control, and ADAS modules. The "HM3" designation also confirms halogen-free and RoHS-compliant construction per J-STD-609.

What does the "_A/H" suffix mean in SMCJ26AHM3_A/H?

The "_A/H" suffix in SMCJ26AHM3_A/H specifies packaging and reel configuration: "A" denotes the revision code (per Vishay's ordering nomenclature), and "H" indicates 7-inch diameter plastic tape-and-reel packaging with 850 units per reel. This format aligns with Vishay's preferred package code "H" in their ordering information table and ensures compatibility with standard SMT pick-and-place equipment using 8-mm carrier tape.

How does the thermal resistance of SMCJ26AHM3_A/H affect PCB layout?

The SMCJ26AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended copper pads (0.31" × 0.31"). To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area-ideally ≥8 mm × 8 mm per terminal-and avoid thermal isolation. Insufficient copper increases steady-state temperature rise and reduces surge endurance, especially in enclosed automotive or industrial enclosures.

Can SMCJ26AHM3_A/H be used in bidirectional configurations?

No, SMCJ26AHM3_A/H is a unidirectional TVS diode, as confirmed by its part number suffix "A" (not "CA") and polarity marking (cathode band). Bidirectional operation requires the "CA" variant (e.g., SMCJ26CA), which lacks polarity marking and exhibits symmetrical clamping in both directions. Using SMCJ26AHM3_A/H in bidirectional circuits would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.